Headboard



FIG. 1 is a front elevational view of a headboard showing my new design, the broken line showing is for illustrating environmental elements only and forms no part of the claimed design;

FIG. 2 is a side elevational view thereof, the opposite side being a mirror image;

FIG. 3 is a top plan view thereof; and,

FIG. 4 is an enlarged partial front perspective, illustrating the left end thereof.

The bottom of the article is not part of the claimed design. 

The ornamental design for a headboard, as shown and described. 